1903.] 



and the Mechanical Friction of the Solvent. 



339 



I beg the honour of laying before the Royal Society the following 

 more complete consideration of the subject. 



The above-mentioned article had for its object the study, from 

 careful measurements made at my request by Mr. Deguisne,* of the 

 influence of temperature on completely dissociated, that is, infinitely 

 dilute aqueous solutions of strong electrolytes, and the deduction from 

 this of the temperature coefficients of the single ions. 



Mr. Deguisne expresses the influence of temperature on the con- 

 ductivity k, starting from 18° as a mean temperature, in the form of 

 the quadratic interpolations equation 



Kt = Kls [i + a ^_l8) + /^-18)- 2 ] 



and shows that this closely represents his observations between 2° and 

 34° C. I shall confine myself to the consideration of this formula. 



(1.) Numerical values. — In the table, under A is given the equivalent 

 conductivity of infinitely dilute solutions,! then the coefficients a and /3 

 for 1/1000 and, for the neutral salts, observed by Deguisne, a also for 







a for 







A. 







P. 





1/10000. 



1/1000. 





KCl 



130-1 



-0216 



0-0217 



+ -000066 



KF 



111*8 





226 



069 



KN0 3 , 



126-4 



210 



211 



062 



EoS0 4 



133-4 



223 



223 



077 



KOH 



239 





190 



033 



Is T H 4 Cl 



130 



219 



219 



068 



NaCl 



109 -0 



228 



227 



084 



NaP 



90 -2 





240 



100 



NaN0 3 



105-3 



*220 



221 



075 



Na.S0 4 



112 -2 



234 



234 



097 



Ts T aaH 3 0. 



78-5 





242 



110 



Is T aC 5 H 9 0o 



69 -2 





244 



111 



LiCl 



98 -9 





233 



091 





121 -7 



227 



226 



083 



Ba(NO ; 2 



118-1 



221 



220 



076 





115 -8 



216 



216 



+ 0-000067 



HC1 



383 





165 



-0 -000015 





380 





163 



-0-000017 



1/10000 normal solutions, corrected by me for the impurity of the 

 water. Mr. Deguisne has kindly furnished me with the data regarding 

 the water in each of his solutions. After applying these corrections 

 the values for 1/10000 and 1/1000 normal do not continue to show 

 the systematic changes, which from the observations appeared to 



eguisne, " Temperatur-Koefficienten des Leifcyermogens sehr verdlinnter 

 wassriger Losuugen," ' Dissertation, Strassburg,' 1893. 



t Kohlrausch u. v. Steinwehr. ' Sitz. Ber. Berlin, Akad./ 1902, p. 581. 



